Thermo-electric annunciator.



PATENTED MAR. 19, 1907.

S. 0. BESTUL. THERM O ELECTRIC A'NNUNGIATOR.

APPLICATION FILED 001212. 1906.

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UNITED STATES PATENT OFFICE.

SEYERIX O; BESTUL, OF IOLA. WISCONSIN.

:THERMO-ELEQT-RIC ANNUNCIATOR.

No; 847,310. I

Specification of Letters Patent.

Patented liarch 19, 1907.

Application filed be 12, 1906. Serial No. 338.610.

To all whom if may cancel .1:

Be it known that I,'SEVERL\' O. BEsT L'L', a

citizen of thelfnited States, residing at Iola,

in the county of Waupaca and State of Wisconsin, have invented certainnew and useful Improvements in T hermo-Electric Enunc'iators; and I dohereby declare the following to bee full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My invention has for its object to provide a simple and efficientthermo-electric enunciator for use in various places for indicating orannouncing when the teniperature hasillustrate the invention, likecharacters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a view, partly in elevation andpartly in diagram, illustrating a thermo-electric enunciator designed inaccordance with my invention: and Fig. 2 is a view corresponding toFig.1, but illustrating a somewhat-modified form of the invention. v

' The numeral 1 indicates-a-suitable supporting-board, preferably ofwood, to one end of which, as shown, is secured a thermometer 2, havingupright rods 3. To the other end of said board 1 a vibratory lever 4 ispivoted on a pin 5, sup orted by the board 1. The short end of the ever4 is ivoted at 6 to a vibratory plate 7, which p ate has a clearanceperforation 8, through which the pivot-pin 5 freely projects. The longend of the lever 4 is adjustably connected to one ex tremity of the late7'by a short thrust-rod '9, the threade ends of which are provided withnuts 10. The lever 4 is also adapted to be firmly clamped against theplate 7 by a short nutted'bolt- 11, that works through a slot- 12 insaid plate. A spring 13, attached to the upper extremity of the plate 7and to the board 1, yieldingly draws the upper thereof toward the rightwith respect to Fig. 1.

The numeral 14 indicates a long expansion-bar of metal, vulcanizedrubber, or other suitable material which will expand and contract undervarying temperatures. This exansion-bar at one end is attached to thecard 1 by a suitable device, such as a screw 15. The other end of theexpansion-bar 14 is connected by a link or coupling 16 to the plate 7 ata point 17, which point is offset from or above the pivot or fulcrum pin5.

Pivoted at 18 to the plate T is a depending arm 19, that is adapted tobe clamped there to in any one of several different adjust-' n ents bym'eans'of a thumb-screw 20. A circuit-closer 1n the form of a long lightmetal rod or finger 21 is secured to the depending end of the arm 19.The projecting end of.

this arm 21 works between a pair of contacts 22 23, that are rigidly butadjustably secured on one of the rods 3 of the thermomv eter 2. v

The numeral 24 indicates a battery or source of electrical energy, andthe numeral 25 indicates an electrically-actuated bell..

Xumeral 26 indicates a battery-wire which runs from one pole of thebattery 24 and is connected to one of the contacts-to wit,'as shown, tothe contact 22. The numeral 26 indicates another battery-wire, whichruns from the other 'pole of .the battery through the coil of the bell25 and is connected to the arm 19. I

In'the construction illustrated in Fig. 2 the arm 19 is eliminated, or.in other words, the said arm 19 and the rod or circuit-closer 21 aremade in one part-to \\it,'in the form of a long pointed arm 27, which ispivoted to the plate 7 at. 27 and is adapted to be "clamped to saidplate 7 in different adjustments by meansof a thumb-screw 29. In thisconstruction the endof the arm 27 would be arranged to work directlybetween and is 'engageable with the cont-acts 22 and 23.

With the wire 26 applied to the lower contact 22 the circuit will beclosed and the bell 25 willbe thrown into action whenever thetemperature lowers so as to cause the arm or.

rod 21 to engage the said contact 22, and the cont act 23 siniplyoperates as a stop to limit the upward movement of the said arm 21.

When it is desired to have the device indicate rising temperatures, thewire 26 should be applied to thecontact 23, and it will of course beunderstood that the said wire ma.

contacts '22 and 23. so that the bell 25 would I y l-lO I be connectedat-tt're'same time to both of said be sounded whenever the temperaturevaries either above or below certain predetermined points.

' The spring 13 acting on the plate 7 tends to raise the free end of thecontact-arm 21; but the movement of said plate is held back or limitedby the expansion-bar 14 and link 16. 7 Under rising temperatures thesaid expansion-bar 14 will lengthen out and permit the free end of thecontact-arm 21 to be raised by the tension of the spring'lS. Underlowering temperatures the said expansion-bar will contract or shorten upand will cause thefree end of said contact-arm 21 to move downward inopposition to the tension of said spring 13. By adjusting the plate 7with respect to the lever 4 the said two parts ing various temperaturesand for announcing or sounding an alarm to indicate that certain changesin temperature have taken place.

What I claimis+ 1. In an apparatus of the kind described,

The desenate the combination witha pivoted lever 4, of a carrier-plate 7adjustably connected to said ver, an expansion-bar 14, anchored at oneend a'nd connected at its other end to said plate 7 and controlling themovements there of, and an electric circuit arranged to be opened andclosed by movements of said plate 7, said circuit including a batteryand an electrically-actuated bell, substantially as described. r

2. In an apparatus of the kind described, the combination with athermometer-and an electric contact 22 a'djustably mounted adjacentthereto, of a pivotedlever 4, a cai'rier plate 7 adjustably connected tosaid le'ver, a spring 13 acting on said plate, an expansionbar 14,anchored at one end and connected at its-other end to said plate 7, anarm 19 adjustably connected to said plate 7, a contactarm 21 carried bysaid arm 19 and cooperating with said adjustable contact 22, and an saidcircuit including a battery and a bell substantially described.

C. S. HLOEL,

, lever, .a spring 13 acting on said plate and le,

electric vcircuit arranged to be openedand' closed by said contactmembers 22 and 23,

In testimony whereof I have ailixed my

